In the following question, select the appropriate word/preposition from the given alternatives to make it a meaningful sentence:
Please call __________ a doctor at once.

Correct option is B

The correct option to fill in the blank is (b) in.
Explanation: “Call in” means to summon someone for help or service, especially a professional like a doctor.
Grammatical rule used:
This is a separable phrasal verb: call + in (someone) meaning to request a person’s presence professionally.
Explanation in Hindi:
“Call in” एक phrasal verb है जिसका अर्थ है “किसी को बुलाना” (विशेष रूप से विशेषज्ञ को)। जैसे डॉक्टर, इंजीनियर आदि।
Meanings of the other options:
· (a) On – Call on means to visit someone formally.
· Hindi meaning: मिलने जाना
· · (c) Out – Call out means to shout or summon loudly.
· Hindi meaning: जोर से पुकारना
· · (d) To – Not used idiomatically with "call" in this context.
· Hindi meaning: की ओर (prepositional direction only)